Question

John is 3 years older than Susan and khalid is 5 years younger than her . The sum of their ages is 40 .

Find their ages.
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Answer 1

John is 17,

Susan is 14,

and Khalid is 9.

Explanation:

a = John's age

b = Susan's age

c = Khalid's age

Let's set our rules from the given information.

a = b + 3

c = b - 5

a + b + c = 40

Now, we can solve for b through substitution.

(b + 3) + b + (b - 5) = 40

3b - 2 = 40

3b = 42

b = 14

So, now that we have Susan's age, we can follow the rules and see if it holds.

17 + 14 + 9 = 40 Viola!